George Osborne's Jawbone: how does the Chancellor sleep at night?

So now we know. The peculiar black wristband that George Osborne was wearing at the Treasury Select Committee earlier (see above) was in fact a Jawbone – a piece of wearable technology that, according to a Telegraph review, is comfortable and stylish. The Chancellor confirmed as much to guffawing journalists at today's Press Gallery lunch.

The point of this gadget? It links to an iPhone app that tells the user if he's living healthily and moving about enough. "You, at a glance" is the motto. Mr Osborne, who turned 42 in May, is certainly trying: here he is running in St James's Park this week.